test: port 732_def_const_fold residue to corpus fixtures

732_def_const_fold.c -> r732_def_xmod_fold (run-exit 42; stronger than
  the carrier's DATA-row grep — links AND reads the folded cross-module
  value), r732_def_xmod_cycle (error 'def value: reference chain too
  deep', upgrading the needle-less exit!=0 check).

The five same-module exec rows and both same-module fail-loud rows were
already owned by the r732_def_* fixtures; their cs-vs-ww byte identity
rides test-data-byteid, which now also covers the xmod fold row. The
timeout-124 hang distinction devolves to the wwfixture harness timeout.

internal/wwfixture/types.ww

@@ -1,13 +1,13 @@
 package wwfixture;
 
 def protocolversion: i32 = 1;
-def corpuscount: i32 = 1641;
-def errorcount: i32 = 337;
+def corpuscount: i32 = 1643;
+def errorcount: i32 = 338;
 def compilecount: i32 = 18;
 def runcount: i32 = 198;
-def runexitcount: i32 = 1088;
-def nativecount: i32 = 3282;
-def corpushash: str = "d518a094a11081af773549c53a6830c510685ef44548c8ea01400e0661c37e65";
+def runexitcount: i32 = 1089;
+def nativecount: i32 = 3286;
+def corpushash: str = "c2bfc683a76c7bffa727612f102893c7dbfdb9e73e56212eed8687b8087d7870";
 
 type directive = enum i32 {
 	ERROR = 0,